Curvecurve Intersection function in Rhino

Hello everyone,
I’m trying to build a plug-in which involves the capture of intersection points of multiple curves. However, I’m not sure what is the maximum distance between two curves that would let Rhino consider there is an intersection point between them. Since it is hard to build two curves exactly intersect with each other, the maximum distance allowance would be very helpful.
Any suggestion on that will be appreciated !